GeForce GTS 450 vs Radeon HD 4650 512MB

Intro

Compare those specs to the Radeon HD 4650 512MB, which uses a 55 nm design. AMD has set the core speed at 600 MHz. The DDR2 memory runs at a frequency of 500 MHz on this specific card. It features 320(64x5) SPUs as well as 32 Texture Address Units and 8 Rasterization Operator Units.

Display Graphs

Hide Graphs

Power Usage and Theoretical Benchmarks

Power Consumption (Max TDP)

Radeon HD 4650 512MB		55 Watts
GeForce GTS 450		106 Watts
	Difference: 51 Watts (93%)

Memory Bandwidth

The GeForce GTS 450 should theoretically perform much faster than the Radeon HD 4650 512MB in general. (explain)

GeForce GTS 450		57728 MB/sec
Radeon HD 4650 512MB		16000 MB/sec
	Difference: 41728 (261%)

Texel Rate

The GeForce GTS 450 is a lot (about 31%) faster with regards to AF than the Radeon HD 4650 512MB. (explain)

GeForce GTS 450		25056 Mtexels/sec
Radeon HD 4650 512MB		19200 Mtexels/sec
	Difference: 5856 (31%)

Pixel Rate

The GeForce GTS 450 is a lot (more or less 161%) more effective at AA than the Radeon HD 4650 512MB, and should be capable of handling higher resolutions without slowing down too much. (explain)

GeForce GTS 450		12528 Mpixels/sec
Radeon HD 4650 512MB		4800 Mpixels/sec
	Difference: 7728 (161%)

Please note that the above 'benchmarks' are all just theoretical - the results were calculated based on the card's specifications, and real-world performance may (and probably will) vary at least a bit.

Price Comparison

Specifications

Memory Bandwidth: Bandwidth is the largest amount of information (in units of megabytes per second) that can be transported across the external memory interface within a second. The number is worked out by multiplying the interface width by its memory speed. If the card has DDR memory, the result should be multiplied by 2 again. If DDR5, multiply by 4 instead. The better the memory bandwidth, the better the card will be in general. It especially helps with anti-aliasing, High Dynamic Range and higher screen resolutions.

Texel Rate: Texel rate is the maximum number of texture map elements (texels) that are applied in one second. This is calculated by multiplying the total texture units by the core speed of the chip. The higher this number, the better the card will be at handling texture filtering (anisotropic filtering - AF). It is measured in millions of texels processed in a second.

Pixel Rate: Pixel rate is the maximum number of pixels the video card can possibly write to the local memory per second - measured in millions of pixels per second. Pixel rate is worked out by multiplying the number of Raster Operations Pipelines by the the core clock speed. ROPs (Raster Operations Pipelines - sometimes also referred to as Render Output Units) are responsible for outputting the pixels (image) to the screen. The actual pixel fill rate is also dependant on lots of other factors, most notably the memory bandwidth of the card - the lower the bandwidth is, the lower the ability to reach the maximum fill rate.